Periodic Table and Trends

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Across
  1. 4. Soft Metals that are very reactive in water and are found in group 1A of the periodic table.
  2. 5. The number of protons(or electrons) found in an atom.
  3. 6. These are the horizontal rows of the periodic table that determine the number of electron energy levels/shells an element has.
  4. 7. These are gases or dull, brittle, & poor conductors of electricity solids, found on the right hand side of the periodic table.
  5. 9. The protons and neutrons are found here.
  6. 11. The distance from the center of the nucleus to the outermost electron.
  7. 16. The tendency of an atom to ATTRACT electrons to form bonds.
  8. 18. Dull brittle solids and toxic gases found in group 7A of the periodic table.
Down
  1. 1. When elements are arranged in order of increasing atomic number.
  2. 2. The number of protons PLUS the number of neutrons found in an atom.
  3. 3. Shiny silver white metals with high melting points, and are found in group 2A of the periodic table.
  4. 8. These are ductile, malleable, shiny, good conductors of heat & electricity and are found on the left hand side of the periodic table.
  5. 10. Unreactive gases, with a full set of valence electrons found in group 8A of the periodic table.
  6. 12. This chemist discovered that properties of elements are determined by their atomic mass/weight and went on to arrange the first periodic table.
  7. 13. This chemist proposed arranging the current periodic table by atomic number instead of atomic mass.
  8. 14. The energy needed to REMOVE an electron.
  9. 15. These are the vertical columns of the periodic table that contain elements that share similar properties.
  10. 17. Semiconductors, with properties of metals and nonmetals and are found on the stair-step section of the periodic table.